MetriCorr
Slimline series
–
ICL-C & MasterLink Operation Manual
18 | 54
4
Line Current Sensor
The Line Current (LC) input on the ICL-C is designed to monitor the current flowing in a steel pipe (or other
structure), hereafter referred to as "pipe", by measuring the voltage drop across a certain span of the pipe.
However, it is possible to measure any voltage source connected to the LC input within the maximum limits
of ± 1.2 Vdc. Data for both DC and AC voltages are accessible in WebService.
The
DC current
in the pipe is calculated by a user-defined DC
resistance and displayed in WebService as a graph.
The
AC current
in the pipe depends on many fluctuating factors such
as soil moisture level and is therefore not calculated in WebService.
The LC input consists of the two terminals LC+ and LC-,
which are galvanically isolated from all other terminals.
4.1
LC input voltage range
The LC input is designed to monitor signals in the µV and mV range with a maximum target DC voltage of 20
mV. However, the maximum allowable input voltage range is ± 1.2 Vdc to allow a much higher AC voltage
signal without clipping the signal as illustrated in the graph below:
If the LC input voltage exceeds 1.2 V, the A/D converter will clip the signal and an error message will be
shown.
Time
0s
5ms
10ms
15ms
20ms
25ms
30ms
35ms
40ms
V(V1:+)
-1.2V
-0.8V
-0.4V
-0.0V
0.4V
0.8V
1.2V
20 mV
DC amplitude: 20 mV
AC amplitude: 1.18 V
Freq: 50 Hz
